Product Description:
The drill collar produced and sold by our company Huichi Petro is a
more important component of the drill string. It has the function
of providing drilling pressure to the drill bit and improving the
rigidity of the drill string.
Drill collars mainly play the following roles in the drilling
process:
(1) Apply drilling pressure to the drill bit;
(2) Ensure the necessary strength under compression conditions;
(3) Reduce the vibration, swing, and jump of the drill bit, so that
the drill bit works smoothly;
(4) Control the well inclination.
We supply slick drill collars, spiral drill collars and
non-magnetic drill collars; their sizes are from 3-1/8 to 11
inches. Besides the drill collars in the table below, we can supply
other drill collars at customers' request. The non-magnetic Drill
Collar of Huichi Petro is made from high-class low carbon stainless
steel, and completely meets the requirement of API Spec 7-1 and
SY/T5144 Standard. It has good low magnetic permeability, high
mechanical property and perfect enduring intergranular corrosion
cracking performance. It is mainly used for the inspection in the
process of petroleum drilling, and the structure is the same with
the ordinary drill collar.A hardness range of 285-341, Brinell
Hardness and Charpy "V" notch minimum impact strength of 40 ft-lb
at 70 F are guaranteed one inch below the surface.
Product Features:
1.Our company offers steel, cast steel and plastic steel thread
protectors for its drill stem products；
2. Widely used in oil, gas, HDD and geothermal field；
3. Connections as phosphate coated father machining to protect the
threads from corrosive elements and to prevent galling upon initial
make -up. Thread roots are cold rolled on API and H0-90
connections；
4.All connections are phosphate-coated or copper plated to improve
resistance to corrosion；
5.We inspect all our drill collars to ensure compliance with API
SPEC 7-1 standards. These inspections include visual dimensional
checks as well as ultrasonic inspections over the entire body of
the drill collar.
Product Display:
Product Application:
Oilfield Well Drilling , Energy , Mining.
Product Model Parameters:
| Specification | Outer diameter (mm) | Inner diameter (mm) | Code | Thread | Length (mm) | Ordering outer diameter (mm) | Ordering length (mm) | Gross weight (kg) | Finished product weight (kg) |
| 3-1/8 | 79.4 | 31.8 (1-1/4) | NC23-31 | NC23 | 9140 | 100 | 9600 | 592 | 298 |
| 3-1/2 | 88.9 | 38.1 (1-1/2) | NC26-35 | NC26 | 9140 | 110 | 9600 | 717 | 364 |
| 4-1/8 | 104.8 | 50.8 (2) | NC31-41 | NC31 | 9140/9450 | 120 | 9600 | 853 | 474/490 |
| 4-3/4 | 120.6 | 50.8 (2) | NC35-47 | NC35 | 9140/9450 | 130 | 9600 | 1001 | 674/697 |
| 5 | 127.0 | 57.2 (2-1/4) | NC38-50 | NC38 | 9140/9450 | 140 | 9600 | 1161 | 725/749 |
| 6 | 152.4 | 57.2 (2-1/4) | NC44-60 | NC44 | 9140/9450 | 165 | 9600 | 1613 | 1125/1163 |
| 71.4 (2-13/16) | NC44-60 | 9140/9450 | 9600 | 1022/1056 |
| 6-1/4 | 158.8 | 57.2 (2-1/4) | NC44-62 | NC44 | 9140/9450 | 170 | 9600 | 1712 | 1237/1279 |
| 71.4(2-13/16) | NC46-62 | 9140/9450 | 9600 | 1134/1172 |
| 6-1/2 | 165.1 | 57.2(2-1/4) | NC46-65 | NC46 | 9140/9450 | 172 | 9600 | 1752 | 1352/1398 |
| 71.4(2-13/16) | NC46-65 | NC50 | 9140/9450 | 9600 | 1249/1291 |
| 6-3/4 | 171.4 | 57.2(2-1/4) | NC46-67 | NC46 | 9140/9450 | 180 | 9600 | 1919 | 1471/1521 |
| 7 | 177.8 | 57.2 (2-1/4) | NC50-70 | NC50 | 9140/9450 | 190 | 9600 | 2138 | 1597/1651 |
| 71.4(2-13/16) | NC50-70 | 9140/9450 | 9600 | 1494/1545 |
| 7-1/4 | 184.2 | 71.4(2-13/16) | NC50-72 | NC50 | 9140/9450 | 200 | 9600 | 2369 | 1625/1680 |
| 7-3/4 | 196.8 | 71.4(2-13/16) | NC56-77 | NC56 | 9140/9450 | 210 | 9600 | 2612 | 1895/ 1960 |
| 8 | 203.2 | 71.4(2-13/16) | NC56-80 | NC56/ 6-5/8REG | 9140/9450 | 210 | 9600 | 2612 | 2040/2109 |
| 8-1/4 | 209.6 | 71.4(2-13/16) | 6-5/8REG | 6-5/8REG | 9140/9450 | 220 | 9600 | 2867 | 2188/2263 |
| 9 | 228.6 | 71.4(2-13/16) | NC61-90 | NC61 | 9140/9450 | 240 | 9600 | 3412 | 2658/2748 |
| 9-1/2 | 241.3 | 76.2(2-13/16) | 7-5/8REG | 7-5/8REG | 9140/9450 | 250 | 9600 | 3702 | 2954/3054 |
| 9-3/4 | 247.6 | 76.2 (3) | NC70-97 | NC70 | 9140/9450 | 255 | 9600 | 3852 | 3127/3234 |
| 10 | 254.0 | 76.2 (3) | NC70-100 | NC70 | 9140/9450 | 270 | 9600 | 4318 | 3308/3421 |
| 11 | 279.4 | 76.2 (3) | 8-5/8REG | 8-5/8REG | 9140/9450 | 290 | 9600 | 4982 | 4072/4210 |
| Mechanical properties: |
| <7-inch drill collar: yield strength≥758MPa, tensile
strength≥965MPa,Four times elongation≥ 13%, Impact energy≥54J,
(Single impact energy≥47J, average value≥54J), Hardness range
285HB~341HB; |
| ≥7-inch drill collar: yield strength≥689MPa,tensile
strength≥931MPa, Four times elongation≥ 13%,Impact energy≥54J,
(Single impact energy≥47J, average value≥54J), Hardness range
285HB~341HB. |
| Drill collar can be customized as per customer's design. |
Product Package:
Iron box or iron frame , or customized according to customer
requirements , or according to customer requirements.
Product Detection:
100% tested before delivery.
Product Delivery Method:
Express, truck , train , air , sea , or customized according to
customer requirements.
About HuiChi (HC) Petro:
Shandong Huichi Petroleum Equipment Co.,Ltd. is a professional
supplier of drilling equipment for the oil and gas industry.
Our Huichi products cover all aspects of drilling , operations ,
oil production , etc. We have rich experience in the production and
export of oil drilling supporting equipment.
Why Choose HuiChi (HC) Petro?
One-stop drilling equipment supply;
More than 10 years of experience in drilling equipment supply;
More than 10 people engaged in export business;
More than 40 partner countries and regions;
More than 200 customers having close cooperative relationships;
More than 250+ partner factories as suppliers.
Let’s work together and enjoy this job!
Sales Manager: Cherry Chi
Email: cherry@huichipetro.com
Mob/WhatsApp/We chat: +86 15553820372
